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| <h2 title="Class ToItemPrefsMapper" class="title">Class ToItemPrefsMapper</h2> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VarLongWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VarLongWritable</a>,<a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VarLongWritable.html?is-external=true" title="class or interface in org.apache.mahout.math">VarLongWritable</a>></li> |
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| <li><a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html" title="class in org.apache.mahout.cf.taste.hadoop">org.apache.mahout.cf.taste.hadoop.ToEntityPrefsMapper</a></li> |
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| <li>org.apache.mahout.cf.taste.hadoop.ToItemPrefsMapper</li> |
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| <pre>public final class <span class="typeNameLabel">ToItemPrefsMapper</span> |
| extends <a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html" title="class in org.apache.mahout.cf.taste.hadoop">ToEntityPrefsMapper</a></pre> |
| <div class="block"><h1>Input</h1> |
| |
| <p> |
| Intended for use with <code>TextInputFormat</code>; |
| accepts line number / line pairs as |
| <code>LongWritable</code>/<code>Text</code> pairs. |
| </p> |
| |
| <p> |
| Each line is assumed to be of the form <code>userID,itemID,preference</code>, or <code>userID,itemID</code>. |
| </p> |
| |
| <h1>Output</h1> |
| |
| <p> |
| Outputs the user ID as a <a href="http://mahout.apache.org/mahout-math/apidocs/org/apache/mahout/math/VarLongWritable.html?is-external=true" title="class or interface in org.apache.mahout.math"><code>VarLongWritable</code></a> mapped to the item ID and preference as a |
| <a href="../../../../../../org/apache/mahout/cf/taste/hadoop/EntityPrefWritable.html" title="class in org.apache.mahout.cf.taste.hadoop"><code>EntityPrefWritable</code></a>. |
| </p></div> |
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| <code>org.apache.hadoop.mapreduce.Mapper.Context</code></li> |
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| <code><a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html#RATING_SHIFT">RATING_SHIFT</a>, <a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html#TRANSPOSE_USER_ITEM">TRANSPOSE_USER_ITEM</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToItemPrefsMapper.html#ToItemPrefsMapper--">ToItemPrefsMapper</a></span>()</code> </td> |
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| <code><a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html#map-org.apache.hadoop.io.LongWritable-org.apache.hadoop.io.Text-org.apache.hadoop.mapreduce.Mapper.Context-">map</a>, <a href="../../../../../../org/apache/mahout/cf/taste/hadoop/ToEntityPrefsMapper.html#setup-org.apache.hadoop.mapreduce.Mapper.Context-">setup</a></code></li> |
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| <h4>ToItemPrefsMapper</h4> |
| <pre>public ToItemPrefsMapper()</pre> |
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